Sci. STKE, 9 May 2000
Apoptosis Self-Destructing Inhibitors
Mammalian cells contain proteins that function as endogenous inhibitors of apoptosis (IAPs) and that act, at least in part, by inhibiting caspases, proteases that mediate signals leading to cell death. In thymocytes, inhibitors of the proteasome, a protein complex that mediates proteolysis of ubiquitin-tagged proteins, can block apoptosis. Yang et al. find that the IAPs have ubiquitin ligase activity and that they appear to catalyze auto-ubiquitination. This activity increases in response to apoptotic stimuli, indicating that regulated proteolysis of IAPs contributes to the control of cell death in thymocytes.
Yang, Y., Fang, S., Jensen, J.P., Weissman, A.M., and Ashwell, J.D. (2000) Ubiquitin protein ligase activity of IAPs and their degradation in proteasomes in response to apoptotic stimuli. Science 288: 874-877. [Abstract] [Full Text]
Citation: Self-Destructing Inhibitors. Sci. STKE 2000, tw6 (2000).
Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882